Very high antennas are used at radio station. These are used for broadcasting.
In space wave propagation, some of the VHF radio waves (30 MHz – 300 MHz) radiated by an antenna can reach the receiver travelling either directly through space or after reflection by the curvature of the earth.
In practice, direct wave mode is more dominant. However, it is limited to the line-of-sight transmission distances and curvature of earth as well as height of antenna restrict the extent of coverage.